频率方向图复合可重构寄生单极子天线阵列

A novel frequency and pattern reconfigurable parasitic monopole antenna array for wireless communications

提出了一种能应用于无线通讯系统的新型介质支撑开关寄生阵列天线。基于八木天线原理，天线可以实现频率及方向图的复合可重构。所引入的开关用来切换不同状态的工作频率并实现方向图的扫描。地支结构用来改善天线的阻抗匹配并展宽频带。测量结果表明：天线阵列可以在保证回波损耗小于-10dB的情况下完全覆盖1710～1880MHZ、1850～1990MHg及2400～2480MHZ三个移动通信频段，并可以方便地实现频率切换及方向图扫描。

A dielectric-supported switched parasitic Yagi monopole antenna array for mobile wireless communications is developed. Based on the Yagi antenna principle,the proposed antenna realizes frequency and pattern reconfiguration, simultaneously. Switches are used to change operating frequency and radiation pattern between different working states. Moreover, a ground branch has been introduced to improve impedance matching and broaden operation bandwidth. The antenna can cover the bands of 1710-1880 MHz,1850-1990 MHz and 2400-2484 MHz with S11〈-10 dB. Measurements including return loss,radiation patterns are presented to verify the proposed design of antenna. Frequency changing and beam scanning can be realized easily.